P2479 code meaning
Exhaust Gas Temperature Out of Range (Bank 1 Sensor 2)
Powertrain system Generic code P24xx codes Check engine light
What P2479 means
P2479 applies the same temperature-limit idea to the second bank 1 probe. On the 2015 Ford 6.7L layout this is EGT12 at the oxidation catalyst outlet, where the exotherm of a regeneration shows up first, so a runaway burn or excessive post-injection can push the reading towards the limit. Ford's 2015 diesel summary lists P2479 alongside P2032 and P2033 and uses a high-side threshold of about 1150 °C; the 2023 edition no longer carries it. No other maker documents the code publicly. When the code appears together with circuit faults of the same probe, fix those first; on its own it calls for a check of injection and regeneration behaviour.
P2479 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2479
- MIL on
- Regeneration aborted
- Reduced power
Common causes of P2479
- Most likelyExcessive heat during regeneration, e.g. too much post-injection
- PossibleLeaking injector adding unburnt fuel to the catalyst
- Less likelyProbe reading too high
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Egt sensor b1s2
What each part of P2479 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 79 | The exact fault in that area. |
What to do next
- Note P2479 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2479
What does P2479 mean?
P2479 means "Exhaust Gas Temperature Out of Range (Bank 1 Sensor 2)". P2479 applies the same temperature-limit idea to the second bank 1 probe. It is a generic code, so it means the same on every make.
Is it safe to drive with P2479?
Drive gently and only to a workshop. With P2479 the car can go into limp mode (reduced power) to protect itself.
Will P2479 fail an emissions test?
Yes, it can. P2479 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2479 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2479 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.